Objective: The purpose of this article is to provide an overview of ultrasound and MR elastography, including a glossary of relevant terminology, a classification of elastography techniques, and a discussion of their respective strengths and limitations.
Conclusion: Elastography is an emerging technique for the noninvasive assessment of mechanical tissue properties. These techniques report metrics related to tissue stiffness, such as shear-wave speed, magnitude of the complex shear modulus, and the Young modulus.
Keywords: MR elastography (MRE); MRI; elasticity; elastography; liver fibrosis; shear stiffness; shear wave; ultrasound; viscoelasticity; viscosity.